February 11, 2011 
Definition:
function add_user_to_blog( $blog_id, $user_id, $role ) {}
Add a user to a blog.
Use the ‘add_user_to_blog’ action to fire an event when users are added to a blog.
Parameters
- int $blog_id: ID of the blog you’re adding the user to.
- int $user_id: ID of the user you’re adding.
- string $role: The role you want the user to have
Defined actions
- add_user_to_blog
do_action('add_user_to_blog', $user_id, $role, $blog_id);
Source code
function add_user_to_blog( $blog_id, $user_id, $role ) {
switch_to_blog($blog_id);
$user = new WP_User($user_id);
if ( empty( $user->ID ) ) {
restore_current_blog();
return new WP_Error('user_does_not_exist', __('That user does not exist.'));
}
if ( !get_user_meta($user_id, 'primary_blog', true) ) {
update_user_meta($user_id, 'primary_blog', $blog_id);
$details = get_blog_details($blog_id);
update_user_meta($user_id, 'source_domain', $details->domain);
}
$user->set_role($role);
do_action('add_user_to_blog', $user_id, $role, $blog_id);
wp_cache_delete( $user_id, 'users' );
restore_current_blog();
return true;
}
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A HitchHackers guide through WordPress 
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